'NoneType' object has no attribute 'size'

[lucidl]

When I choose "add" -> button with "image occlusion" I get the following error. Where could be the problem? (Ubuntu 12.04). Sometimes helpes restarting the computer, sometimes it corrects after some time period, now the problem lasts and I can't get rid off it.

Traceback (most recent call last):
File "/home/lucidl/Anki/addons/image_occlusion_2/image_occlusion.py", line 86, in add_notes
self.call_ImageOcc_Editor(image_path)
File "/home/lucidl/Anki/addons/image_occlusion_2/image_occlusion.py", line 98, in call_ImageOcc_Editor
d = svgutils.image2svg(path)
File "/home/lucidl/Anki/addons/image_occlusion_2/svgutils.py", line 55, in image2svg
width, height = im.size
AttributeError: 'NoneType' object has no attribute 'size'

[lucidl]

I changed the code as follows: It seems that the problem was something with clipboard.
def add_notes(self):
#clip = QApplication.clipboard()
#if clip.mimeData().imageData():
#handle, image_path = tempfile.mkstemp(suffix='.png')
#clip.image().save(image_path)
#self.image_path = image_path
#clip.clear()
#self.call_ImageOcc_Editor(image_path)

    #else:
    image_path = QtGui.QFileDialog.getOpenFileName(None, # parent
                                                   FILE_DIALOG_MESSAGE,
                                                   os.path.expanduser('~'),
                                                   FILE_DIALOG_FILTER)
    if image_path:
      self.image_path = image_path
      self.call_ImageOcc_Editor(image_path)          

[cicabum]

What file should i change? I have the same problem :-(

[lucidl]

I commented lines 80 .. 88 in file Anki/addons/image_occlusion_2/image_occlusion.py, you can see them in my previous post (Commented lines begin with #)